Bambance-bambance tsakanin mizani da matsayi
GB/T 9948: Ya dace da bututun ƙarfe marasa sumul a cikin yanayi na matsakaici da zafi mai yawa (≤500℃) kamarfashewar man feturkumakayan aikin sinadarai, kuma yana cikin ƙa'idar bututun musamman.
GB/T 5310: An tsara shi musamman donboilers masu matsin lamba mai yawa(sigogi na tururi ≥9.8MPa), yana jaddada aminci na dogon lokaci a ƙarƙashin zafi mai yawa da matsin lamba mai yawa kuma shine babban ma'aunin bututun tukunya.
Babban bambance-bambance a cikin kayan aiki da aiki
Sinadarin sinadarai
Idan aka kwatanta da ƙarfe 20,20Gƙarfe yana da ƙarfi wajen sarrafa ƙazanta (kamar P≤0.025%, S≤0.015%), kuma yana buƙatar jimillar adadin abubuwan da suka rage (Cu, Cr, Ni, da sauransu) su zama ≤0.70% don tabbatar da kwanciyar hankali mai zafi.
Kayayyakin injina
Ƙarfin juriyar ɗakin da zafin jiki na 20G (410-550MPa) ya yi kama da na ƙarfe 20 (≥410MPa), amma 20G yana buƙatar tabbatar da ƙarfin juriya mai zafi a 450℃ (≥110MPa), wanda shine babban buƙatar bututun tukunya.
Tsarin ƙananan halittu
Ana buƙatar a duba 20G don ganin matakin spheroidization na pearlite (≤ mataki na 4) don hana lalacewar ƙananan tsarin bayan dogon sabis na zafi mai zafi, yayin da ƙarfe 20G ba shi da irin wannan buƙata.
Bambance-bambancen tsarin masana'antu
Maganin zafi
Dole ne a yi wa 20G magani mai daidaita (Ac3+30℃) don tabbatar da girman hatsi na matakin 5-8. Ana iya ƙara ƙarfe 20 ko daidaita shi, kuma sarrafa tsarin yana da sassauƙa.
Gwaji mara lalatawa
20G yana buƙatar gano lahani na ultrasonic da gwajin halin yanzu na kowane yanki, yayin da ƙarfe 20G yawanci yana buƙatar duba samfur kawai.
Kwatanta yanayin aikace-aikace
20G: Boilers na tashar wutar lantarki (bango masu sanyaya ruwa, masu dumama ruwa), masu samar da sinadarai masu matsin lamba (yanayin da yanayin zafin ƙira ya wuce 350℃)
ƙarfe 20: Bututun bututu don dumama tanderu a matatun mai, bututun bututu don na'urorin tace iska da injin (yawanci zafin jiki ƙasa da 350℃)
Bukatun Takaddun Shaida
Bututun ƙarfe 20G suna buƙatar samun Lasisin Masana'antu na Musamman (takardar shaidar TS), kuma kowane rukuni dole ne ya bayar da rahoton gwajin aiki mai zafi. Karfe 20 kawai yana buƙatar takardar shaidar garantin inganci na yau da kullun.
Shawarwarin zaɓi:
Idan ana maganar ayyukan ba da takardar shaida na ASME ko PED, 20G na iya dacewa daSA-106B/ASTM A192, yayin da ƙarfe 20 ba shi da wata alaƙa kai tsaye da kayan Amurka na yau da kullun.
Don yanayin aiki sama da 540℃, ya kamata a yi la'akari da ƙarfen ƙarfe kamar 12Cr1MoVG. Iyakar zafin da ya dace na 20G shine 480℃ (muhimmin wurin graphitization na ƙarfen carbon).
Lokacin Saƙo: Mayu-23-2025
